William Ladd Fusee Chain-Drive Presentation Microscope, Lacquered Brass, 1851-55

Here we have a rare and fine English presentation microscope, with a fusee chain-drive focusing mechanism. This design was patented and pioneered by William Ladd of Walworth, London, England. While it is unmarked aside from the presentation inscription, it is marked with his patent. Circa 1851-1855.The inscription on the microscope reads: "To B.P. Davidson, Esqr. From the Members of the Armagh Natural History Society In Token of Their Sense of His Valuable Exertions for that Institution." The bar limb is marked "Chain Adjustment REGISTERED May 18th 1851."This microscope was originally purchased by the estate owner in 1975, and the original sales description includes the following: "Bright brass, original lacquer finish, 14" h (min) extending to 16 1/2", chain drive coarse focus and nose piece fine focus screw, two axis driven mechanical stage 2 1/2" sq with rotating aperture disc and 2" dual mirror below. The stand is derived from Ross with the bar limb supporting the 7 3/4" long micro